WO2022224519A1 - Dispositif de communication sans fil, terminal de communication sans fil et procédé de communication sans fil - Google Patents

Dispositif de communication sans fil, terminal de communication sans fil et procédé de communication sans fil Download PDF

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Publication number
WO2022224519A1
WO2022224519A1 PCT/JP2022/003001 JP2022003001W WO2022224519A1 WO 2022224519 A1 WO2022224519 A1 WO 2022224519A1 JP 2022003001 W JP2022003001 W JP 2022003001W WO 2022224519 A1 WO2022224519 A1 WO 2022224519A1
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Prior art keywords
signal
information
wireless communication
transmission
frequency band
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PCT/JP2022/003001
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English (en)
Japanese (ja)
Inventor
悠介 田中
博允 内山
茂 菅谷
健 田中
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ソニーグループ株式会社
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Priority to US18/554,994 priority Critical patent/US20240205898A1/en
Priority to EP22791304.3A priority patent/EP4329405A1/fr
Publication of WO2022224519A1 publication Critical patent/WO2022224519A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present technology relates to a wireless communication device, a wireless communication terminal, and a wireless communication method, and more particularly to a wireless communication device, a wireless communication terminal, and a wireless communication method capable of improving frequency utilization efficiency.
  • unlicensed wireless communication is used to collect information from many sensors in a factory and control manufacturing equipment.
  • IEEE 802.11ax adopts UL OFDMA (Up-Link Orthogonal Frequency-Division Multiple Access) to narrow-band and multiplex frequency resources, and at the same time transmit information from many sensors (hereafter referred to as STA: Station). enables collection.
  • STA Station
  • STA Station
  • the power density of transmission signals increases and the communication range of STAs expands.
  • the frequency band used by the AP (Access Point), which is the base station, is not narrowed, the power density of the transmission signal remains the same, and the communication range of the AP and STA can become asymmetric.
  • IEEE 802.11ax adopts a technology called ER (Extended Range), in which APs transmit in a band that is half the conventional range (eg, 10MHz).
  • ER Extended Range
  • the power density of the transmission signal is increased, the communication range of the AP is widened, and the communication range can be made symmetrical.
  • the STA that receives the signal transmitted by ER detects that the received signal is the signal transmitted by ER, and then receives the subsequent signal on the high frequency side to transmit in half the bandwidth. signal can be received.
  • Patent Literature 1 describes a technique for allocating frequency channels based on the channel usage status and the attributes of a user terminal. is not described.
  • the AP when the AP uses ER, from the viewpoint of backward compatibility, the AP does not narrow the band at the beginning of the signal, but transmits it with a bandwidth and signal format for backward compatibility, and narrows from the middle of the signal. Perform banding.
  • the frequency band secured by the AP is 20MHz, but the part that actually transmits effective information is 10MHz, which reduces frequency utilization efficiency.
  • unnecessary backward compatibility reduces spectral efficiency.
  • This technology has been developed in view of this situation, and is intended to improve frequency utilization efficiency.
  • a wireless communication device includes a communication control unit that transmits a first signal in which at least a first part of a preamble and a payload are band-narrowed.
  • a wireless communication terminal is a wireless communication device in which at least a first part of a preamble and a payload transmitted from a wireless communication device that is connected or that is a candidate for connection are narrowbanded. 1 signal is provided.
  • a first signal is transmitted in which at least the first part of the preamble and the payload are narrowbanded.
  • a first signal in which at least a first part of a preamble and a payload are narrowband transmitted from a wireless communication device that is connected or that is a candidate for connection is received.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present technology
  • FIG. 1 is a block diagram showing a configuration example of a wireless communication device
  • FIG. It is a figure which shows the structural example of the 1st format of a beacon signal.
  • FIG. 4 is a diagram showing a timing chart of a first example of a beacon signal transmission sequence according to the first embodiment
  • FIG. 7 is a diagram showing a timing chart of a second example of a beacon signal transmission sequence in the first embodiment
  • 4 is a flowchart for explaining AP processing.
  • 10 is a flowchart for explaining STA processing.
  • FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment of the present technology
  • FIG. 1 is a block diagram showing a configuration example of a wireless communication device
  • FIG. It is a figure which shows the structural example of the 1st format of a beacon signal.
  • It is a figure which shows the structural example of
  • FIG. 4 is a diagram showing a sequence of information exchange between a central control unit and APs;
  • FIG. 11 is a diagram showing a configuration example of a third format of a beacon signal;
  • FIG. 10 is a diagram showing a timing chart of a first example of a beacon signal transmission sequence according to the second embodiment;
  • FIG. 10 is a diagram showing a timing chart of a second example of a beacon signal transmission sequence according to the second embodiment;
  • 4 is a flowchart for explaining AP processing. It is a block diagram which shows the structural example of a computer.
  • FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present technology.
  • the dashed line indicates connection by wireless communication
  • the solid line indicates connection by wired communication.
  • the radio communication system 1 of FIG. 1 is composed of AP1 and AP2, which are radio communication devices operating as base stations, and STA1-1 to STA1-3 and STA2-1 to STA2-3, which are radio communication devices operating as terminals. be done.
  • STA1-1 to STA1-3 will be referred to as STA1 unless they need to be distinguished, and STA2-1 to STA2-3 will be referred to as STA2 if they do not need to be distinguished.
  • AP1 and AP2 are referred to as APs when there is no particular need to distinguish them, and STA1 and STA2 are referred to as STAs when there is no particular need to distinguish them. Note that the number of APs and STAs is an example, and is not limited to the example in FIG.
  • STA1-1 to STA1-3 are connected to AP1 by wireless communication.
  • STA2-1 to STA2-3 are connected to AP2 by wireless communication.
  • AP1 and AP2 as well as STA1-1 to STA1-3 and STA2-1 to STA2-3 are operating in a terminal management environment area indicated as Managed area.
  • a terminal management environment area is an area where radio interference from the outside is blocked and all wireless communication devices operating in a certain frequency band transmit and receive signals using the format according to this technology, which will be described later. Therefore, in the terminal management environment area, there is no wireless communication device that does not transmit a signal using the format according to the present technology.
  • the format according to the present technology at least part of the preamble and the payload are narrowband.
  • Some of the communication parameters of the wireless communication device itself and other wireless communication devices are input in advance to the wireless communication device operating in the terminal management environment area.
  • the wireless communication system 1 can include, as its component, a central control unit 10 that connects with AP1 and AP2 and performs control and information exchange with respect to AP1 and AP2.
  • a central control unit 10 that connects with AP1 and AP2 and performs control and information exchange with respect to AP1 and AP2.
  • the central control device 10 is provided outside the terminal management environment area, but the central control device 10 may be provided inside or outside the terminal management environment area.
  • the central control device 10 is configured as a specific device in FIG. However, the central control unit 10 may be implemented in the cloud or an edge that transmits data collected between terminals and a network on the terminal side in IoT, or may constitute a part of the AP.
  • the central control unit 10 may have the function of a frequency sharing system that shares frequencies, or may be connected to other devices having the same function.
  • FIG. 2 is a block diagram showing a configuration example of a wireless communication device.
  • the wireless communication device 11 shown in FIG. 2 is a wireless communication device that operates as an AP or STA.
  • the wireless communication device 11 is composed of a communication section 31 , a control section 32 , a storage section 33 and an antenna 41 .
  • the communication unit 31 transmits and receives data.
  • the communication unit 31 is configured to include an amplifier unit 51 , a radio interface unit 52 , a signal processing unit 53 , a data processing unit 54 , a communication control unit 55 and a communication storage unit 56 .
  • the amplifier unit 51 amplifies the analog signal supplied from the wireless interface unit 52 to a predetermined power during transmission, and outputs the analog signal with the amplified power to the antenna 41 .
  • the amplifying unit 51 amplifies the analog signal supplied from the antenna 41 to a predetermined power during reception, and outputs the amplified analog signal to the radio interface unit 52 .
  • a part of the function of the amplifier section 51 may be included in the wireless interface section 52 . Also, part of the functions of the amplification unit 51 may be a component outside the communication unit 31 .
  • the radio interface unit 52 converts the transmission symbol stream from the signal processing unit 53 into an analog signal, performs filtering, up-conversion to a carrier frequency, and phase control, and transmits the phase-controlled analog signal to an amplifier unit. 51.
  • the radio interface unit 52 performs phase control, down-conversion, and inverse filtering on the analog signal supplied from the amplifier unit 51, generates a reception symbol stream that is the result of conversion to a digital signal, and performs signal processing. Output to unit 53 .
  • the signal processing unit 53 performs encoding, interleaving, modulation, etc. on the data unit supplied from the data processing unit 54, adds a physical header, generates a transmission symbol stream, and outputs it to the radio interface unit 52. do.
  • the signal processing unit 53 analyzes the physical header of the received symbol stream supplied from the wireless interface unit 52 at the time of reception, performs demodulation, deinterleaving, decoding, etc. on the received symbol stream, and generates data units.
  • the generated data unit is output to the data processing section 54 .
  • the data processing unit 54 performs sequence management of the data held in the communication storage unit 56 and the control information and management information received from the communication control unit 55 at the time of transmission.
  • the data processing unit 54 performs encryption processing of control information and management information, etc., generates data units, performs channel access operations based on carrier sense, and adds a MAC (Media Access Control) header to data to be transmitted. Then, an error detection code is added, and multiple concatenation processing of data units is performed.
  • MAC Media Access Control
  • the data processing unit 54 performs decoupling processing, analysis and error detection of the MAC header of the received data unit, retransmission request operation, data unit analysis processing, and reorder processing.
  • the data processing unit 54 is connected to an individual data processing unit that performs operations necessary for communication in a single frequency band and a plurality of individual data processing units, and is connected to a common data processing unit that performs operations common to communications in a plurality of frequency bands. and a data processing unit.
  • the communication control section 55 controls the operation of each section of the communication section 31 and information transmission between the sections. Further, the communication control unit 55 performs control to transfer control information and management information to be notified to other wireless communication devices to the data processing unit 54 .
  • the communication control unit 55 controls each unit so that signals are transmitted using the format according to the present technology.
  • the communication control unit 55 controls each unit so as to receive signals using the format according to the present technology.
  • the communication control unit 55 may control a wired communication unit (not shown) to control communication with the central control device 10.
  • the communication storage unit 56 holds information used by the communication control unit 55.
  • the communication storage unit 56 also holds data to be transmitted and data received.
  • the control unit 32 is composed of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and the like.
  • the control unit 32 executes programs stored in a ROM or the like, and controls the communication unit 31 and the communication control unit 55 . Also, the control unit 32 may perform part of the operation of the communication control unit 55 instead. Also, the communication control unit 55 and the control unit 32 may be configured as one block.
  • the storage unit 33 holds information used by the communication unit 31 and the control unit 32. Moreover, the memory
  • the storage unit 33 and the communication storage unit 56 may be configured as one block.
  • each of the antennas 41, amplifiers 51, and wireless interface units 52 is set as one set, and the number of sets is not limited to two, and three or more.
  • a set may be a component of the wireless communication device 11 .
  • the communication unit 31 is realized by one or more LSIs.
  • First Embodiment> As a first embodiment of the present technology, an example will be described in which an AP transmits a narrowband signal in which at least part of a preamble and a payload are narrowbanded in a terminal management environment area. At that time, a narrowband signal transmitted by a certain AP is multiplexed with another narrowband signal by another AP based on the frequency information included in the narrowband signal.
  • beacon signal is transmitted as a narrowband signal
  • what is transmitted as a narrowband signal is not limited to the beacon signal, and may be another frame.
  • the narrowed beacon signal of the second format is multiplexed on the narrowed portion of the beacon signal of the first format.
  • FIG. 3 is a diagram showing a configuration example of the first format of the beacon signal transmitted by the AP in the first embodiment.
  • the beacon signal of the first format is composed of Pre-New modulation portion, New modulation portion1, and New modulation portion2.
  • the Pre-New modulation portion includes L-STF (Legacy Short Training Field) and L-LTF (Legacy Long Training Field).
  • New modulation portion1 contains New-SIG-1.
  • New modulation portion2 includes New-STF, New-LTF, New-SIG-2, Payload, and PE (Packet Extension).
  • beacon signal of the first format fields other than Payload and PE are preambles. Also, in the beacon signal of the first format, as shown in FIG. 5 described later, New-STF, New-LTF, and New-SIG-2 are part of the preamble, Payload and PE and narrowband become. Also, for convenience of explanation, only the Payload will be referred to when the Payload is narrowband, but the PE is also narrowband in the same manner as the Payload.
  • L-STF and L-LTF are known signal sequences for the receiving side equipment to perform frequency offset estimation, timing synchronization, reception gain adjustment, etc.
  • the Pre-New modulation portion is transmitted in the entire frequency band for which the AP has acquired transmission rights.
  • the Pre-New modulation portion is transmitted in units of 20MHz.
  • the Pre-New modulation portion is duplicated and transmitted every 20 MHz when a frequency band over 20 MHz is allocated, for example when a frequency band of 40 MHz is allocated.
  • the Pre-New Modulation Portion may be duplicated and transmitted every 20 MHz, or may be transmitted in a portion other than a part of the frequency band within 80 MHz.
  • New-SIG-1 is a RU (Resource Unit) that is part of the frequency band for which the AP has acquired the transmission right, and includes information indicating the RU to which New modulation portion2 is transmitted.
  • RU Resource Unit
  • New-SIG-1 contains information indicating the RU to which New modulation portion2 is transmitted and the OFDM signal format and modulation coding scheme used in New modulation portion2.
  • New-SIG-1 may include multiplexing permission information that permits other APs to multiplex from the middle of this signal and transmit other signals.
  • New-SIG-1 uses information indicating the type of other signals, information indicating the RU that transmits the other signals, information about the identifier of the AP that uses the RU, and uses the RU.
  • Information on the transmission power setting of the AP and information on the transmission power setting of the AP transmitting this signal may be included.
  • New-SIG-1 may include information indicating the format type used by this signal.
  • New-SIG-1 may include a CRC (Cyclic Redundancy Check).
  • CRC Cyclic Redundancy Check
  • New-SIG-1 may include a tail bit that adjusts the length of New-SIG-1 and secures time for the receiving device to decode New-SIG-1 and configure its operation.
  • New modulation portion 1 is transmitted in the same frequency band as Pre-New modulation portion.
  • New modulation portion 1 uses the same OFDM signal format and modulation coding method as Pre-New modulation portion, or the OFDM signal format and modulation coding method used by New modulation portion 2 indicated by New-SIG-1.
  • New-STF and New-LTF are known signal sequences for frequency offset estimation, timing synchronization, reception gain adjustment, channel estimation, etc.
  • the New-STF may be repeated multiple times to give the receiving device time to decode the New-SIG-1 and configure its operations.
  • New-SIG-1 may include information indicating whether or how many times to repeat New-STF.
  • New-SIG-2 may include information indicating the format type used by this signal.
  • New-SIG-2 may include the communication specification version corresponding to this signal, signal length, occupation period length, communication direction, network identifier, and the like.
  • Payload is a field that contains beacon signal information.
  • PE is a field for adjusting the length of the signal.
  • New modulation portion2 is sent in the RU that sends New modulation portion2 indicated in New-SIG-1.
  • New modulation portion 2 uses the OFDM signal format and modulation coding scheme used by New modulation portion 2 shown in New-SIG-1.
  • FIG. 4 is a diagram showing a configuration example of the second format of the beacon signal transmitted by the AP in the first embodiment.
  • the beacon signal of the second format is composed of New modulation portion1 and New modulation portion2.
  • New modulation portion 1 includes New-STF and New-LTF.
  • New modulation portion2 includes New-SIG, Payload, and PE.
  • beacon signal of the second format fields other than Payload and PE are preambles.
  • the preamble is narrowed to Payload and PE, as shown in FIG. 5, which will be described later. Also, for convenience of explanation, only the Payload will be referred to when the Payload is narrowband, but the PE is also narrowband in the same manner as the Payload.
  • New-STF, New-LTF, Payload, and PE contain the same information as in Figure 3.
  • New-SIG contains the same information as New-SIG-2 in FIG.
  • New modulation portion1 and New modulation portion2 are transmitted in RUs that are part of the frequency band allocated in New-SIG-1 of the first format beacon signal (Fig. 3) in which this signal is multiplexed.
  • the RUs to which New modulation portion1 and New modulation portion2 are sent are the same.
  • New modulation portion1 may be sent in the same or different OFDM signal format as New modulation portion2.
  • the OFDM signal format may have shorter OFDM symbols or longer Guard Intervals to reduce inter-symbol interference when received by STAs.
  • the OFDM symbol and Guard Interval may be made identical in the OFDM signal format to simplify the reception operation and configuration of the STA. Note that the OFDM signal format and modulation coding scheme known to STAs are used for New modulation portion1.
  • FIG. 5 is a diagram showing a timing chart of a first example of a beacon signal transmission sequence according to the first embodiment.
  • AP and STA obtain information on beacon signal transmission and reception in advance.
  • the APs and STAs may obtain information on transmission and reception of beacon signals from the central controller 10, or may obtain it off-line by a method such as manual input. Also, the AP and STA may transmit information regarding their own identifiers to the central controller 10, or may supply the information to the central controller 10 off-line via a recording medium or the like. That is, the information about transmission and reception of the beacon signal is information obtained by information exchange between the central control device 10 and the APs and STAs, and is hereinafter referred to as information obtained by information exchange.
  • the information obtained by the AP through information exchange includes information on multiple frequency bands that are candidates for transmitting beacon signals.
  • the information obtained by the AP through information exchange may include information specifying the format used for beacon signals.
  • Information obtained by an AP through information exchange may include information on the location, identity, and transmission power of other APs.
  • Information obtained by the AP through information exchange may include information on the location of the STA.
  • the information obtained by the AP through information exchange may include security-related information.
  • the information that the AP obtains through information exchange may include information on the wireless communication status of multiple candidate frequency bands.
  • the information obtained by the AP through information exchange may be information indicating whether a certain frequency band can be used, information indicating whether use is recommended, or information regarding the degree of communication congestion.
  • Information obtained by AP through information exchange may include information on restrictions based on legislation.
  • the information obtained by the AP through information exchange includes information on the maximum transmission power of a certain frequency band, whether or not carrier sensing is necessary, backoff operation parameters, and power detection thresholds.
  • the information that the AP obtains through information exchange may include information about the time when the terminal management environment area becomes valid and information about the current time, or information indicating whether the terminal management environment area is valid.
  • the information that the STA obtains through information exchange may include information on the identifier of the AP to which it should connect.
  • Information obtained by STAs through information exchange may include security-related information.
  • AP1 uses the first format to start transmitting a beacon signal in one of the plurality of candidate frequency bands among the information obtained by the information exchange described above. .
  • AP1 uses a frequency band of 20 MHz from timing t m to timing t m+1 to transmit Pre-New modulation portion (L-STF, L-LTF) and New modulation portion 1 (New-SIG) of the beacon signal. -1).
  • Pre-New modulation portion L-STF, L-LTF
  • New-SIG New modulation portion 1
  • AP1 uses RU (for example, RU in the high band of the 20 MHz frequency band), OFDM signal format, and modulation coding method among the information obtained by information exchange, and uses New modulation Send portion2 (New-SIG, New-STF, New-LTF, Payload, PE) to complete beacon signal transmission.
  • RU for example, RU in the high band of the 20 MHz frequency band
  • OFDM signal format for example, OFDM signal format
  • modulation coding method among the information obtained by information exchange
  • New modulation Send portion2 New-SIG, New-STF, New-LTF, Payload, PE
  • AP2 After detecting the Pre-New modulation portion of the beacon signal transmitted from AP1 at timing t m , AP2 receives New-SIG-1 of New modulation portion 1 at timing t m+1 , and receives New-SIG-1 Get the multiplexing permission information and related information contained in the .
  • AP2 determines RU based on information obtained by information exchange (for example, low-band RU in the 20 MHz frequency band), OFDM signal format, modulation Beacon signals are transmitted according to the coding method and transmission power.
  • AP2 may transmit a beacon signal in synchronization with the transmission of the last New-STF. .
  • each STA connected to AP1 and AP2 detects the Pre-New modulation portion of the beacon signal transmitted by AP1 at timing t m , and then receives New-SIG-1 transmitted by AP1 at timing t m+1 . do.
  • Each STA1 connected to AP1 waits to receive a beacon signal in the RU where New modulation portion2 included in New-SIG-1 is transmitted (20MHz frequency band high-band RU), and at timing tm +2 , to detect and receive beacon signals.
  • Each STA2 connected to AP2 waits to receive a beacon signal in the RU (low-band RU in the 20MHz frequency band) determined based on the multiplexing permission information and related information included in New-SIG-1, and waits for the beacon signal at timing t At m+2 , detect and receive a beacon signal.
  • another beacon signal may be transmitted, and information may be exchanged with the central control device 10 at that time. Further, another beacon signal may be transmitted in a frequency band different from the transmission of the initial beacon signal among the plurality of candidate frequency bands obtained by information exchange.
  • the frequency band of another beacon signal may be determined based on the information regarding the wireless communication status among the information obtained by exchanging information. Further, when starting transmission of beacon signals, operation parameters may be set or changed based on information regarding restrictions based on legislation.
  • the transmission power of the beacon signal in the above sequence may be determined based on the location information of other APs and STAs among the information obtained by information exchange. Also, the transmission power may be determined based on information about the communication status received from the STA. In this case, the information obtained by exchanging information is reception RSSI information of signals transmitted from each AP.
  • the transmission power is information on the transmission power setting included in New-SIG-1 of the first format. may be set based on
  • transmission of beacon signals using the above-described first format and second format may not be performed in all beacon signals.
  • transmission of beacon signals using the first format and the second format described above may be performed only with beacon signals including DTIM (Delivery Traffic Indication Map), or beacon signals without DTIM may be done only.
  • DTIM Delivery Traffic Indication Map
  • a signal narrowed by a high-frequency RU of the frequency band used for a beacon signal is transmitted from AP1, and at the same timing, a signal narrowed by a low-frequency RU is transmitted. is sent from AP2.
  • AP1 a signal narrowed by a high-frequency RU of the frequency band used for a beacon signal
  • a signal narrowed by a low-frequency RU is transmitted. is sent from AP2.
  • a fixed frequency (RU) is not used as in the past.
  • the narrowband signal transmitted by AP2 (on one side of a subcarrier) can be orthogonalized at the frequency (RU) used in the signal transmitted by AP1 (on the other side of a subcarrier).
  • RU frequency
  • FIG. 6 is a diagram showing a timing chart of a second example of the beacon signal transmission sequence according to the first embodiment.
  • the timing chart in FIG. 6 differs from the timing chart in FIG. 5, which allocates 2 RUs, in that it allocates 3 RUs.
  • the central RU of the 20 MHz frequency band is assigned to AP1, the high-frequency RU to AP2, and the low-frequency RU to AP3.
  • AP1 transmits up to Pre-New modulation portion and New modulation portion1 of the first format of the beacon signal using the frequency band of 20 MHz from timing tm to timing tm +1 .
  • AP1 uses RU (central RU in the 20 MHz frequency band), OFDM signal format, and modulation coding method among the information obtained by information exchange to transmit New modulation portion. to complete the beacon signal transmission.
  • AP2 and AP3 After detecting the Pre-New modulation portion of the beacon signal transmitted from AP1 at timing t m , AP2 and AP3 receive New-SIG-1 of New modulation portion 1 at timing t m+1 , Get the multiplexing permission information and related information contained in -1.
  • AP2 determines RU based on information obtained by information exchange (high-frequency RU in the frequency band of 20 MHz), OFDM signal format, modulation coding Beacon signals are transmitted according to the method and transmission power.
  • AP3 uses the second format, at timing t m + 2 , RU determined based on information obtained by information exchange (for example, RU in the low band of the 20 MHz frequency band), OFDM signal format, Beacon signals are transmitted according to the modulation coding method and transmission power.
  • each STA connected to AP1 to AP3 receives New-SIG-1 transmitted by AP1 at timing tm +1 after detecting the Pre-New modulation portion of the beacon signal transmitted by AP1 at timing tm. do.
  • Each STA1 connected to AP1 waits to receive a beacon signal in the RU (e.g., RU in the middle band of the 20MHz frequency band) to which New modulation portion2 included in New-SIG-1 is transmitted, and waits for the beacon signal at timing tm + In 2 , a beacon signal is detected and received.
  • a beacon signal in the RU (e.g., RU in the middle band of the 20MHz frequency band) to which New modulation portion2 included in New-SIG-1 is transmitted, and waits for the beacon signal at timing tm + In 2 , a beacon signal is detected and received.
  • Each STA2 connected to AP2 waits to receive a beacon signal in an RU determined based on the multiplexing permission information and related information included in New-SIG-1 (for example, a low-band RU in the 20MHz frequency band), At timing tm +2 , the beacon signal is detected and received.
  • New-SIG-1 for example, a low-band RU in the 20MHz frequency band
  • Each STA3 connected to AP3 waits to receive a beacon signal in the RU where New modulation portion2 included in New-SIG-1 is transmitted (RU in the low frequency band), and at timing t m+2 , the beacon Detects and receives signals.
  • each of the three RUs does not necessarily have to be assigned to different APs, and for example, the high band RU and the low band RU may be assigned to the same AP.
  • FIG. 7 is a flowchart for explaining AP processing.
  • step S11 the AP exchanges information with the central control unit 10.
  • step S12 the AP determines whether or not to transmit a signal in the first format in which at least part of the preamble and payload are narrowband. If it is determined in step S12 that the signal is to be transmitted in the narrow band first format (in the case of AP1 in FIG. 5), the process proceeds to step S14.
  • step S12 If it is determined in step S12 that the signal is not to be transmitted in the narrowband first format (in the case of AP2 in FIG. 5), the process proceeds to step S13.
  • the AP receives signals in the first narrowband format transmitted from other APs.
  • step S13 based on New-SIG-1 of the received signal, the AP determines whether or not it is permitted to multiplex and transmit the signal transmitted by another AP. If it is determined in step S13 that the multiplexed transmission with the signal transmitted by another AP is not permitted (in the case of AP2 in FIG. 3), the process proceeds to step S14.
  • step S14 the AP, in the case of AP1, sets communication parameters based on information obtained by exchanging information with the central control unit 10.
  • the AP sets communication parameters based on information obtained by exchanging information with the central control unit 10 and information included in signals received from another AP (AP1 in the case of FIG. 5).
  • step S15 the AP determines whether or not to set transmission power. If it is determined in step S15 that the transmission power is set, the process proceeds to step S16.
  • step S16 the AP sets the transmission power based on the positional relationship between the other APs and the STAs obtained by exchanging information with the central control device 10. That is, transmission power setting (Transmit Power Control) is performed based on the positional relationship between other APs and STAs. This makes it possible to further reduce interference due to band narrowing.
  • transmission power setting Transmit Power Control
  • step S15 If it is determined in step S15 that the transmission power is not to be set, step S16 is skipped and the process proceeds to step S17.
  • step S17 the AP, in the case of AP1, transmits a signal in the first format in which part of the preamble and payload are narrowbanded.
  • the AP in the case of AP2, transmits signals in a second format that narrows the preamble and payload. After that, the process ends.
  • step S13 if it is determined in step S13 that the multiplexed transmission with the signal transmitted by another AP is not permitted, the process ends.
  • FIG. 8 is a flowchart for explaining STA processing.
  • step S31 the STA exchanges information with the central control unit 10.
  • step S32 the STA receives part of the preamble of the signal (Pre-New modulation portion and New modulation portion 1 of the first format in FIG. 5).
  • step S33 the STA sets the reception operation based on information obtained by exchanging information with the central controller 10 and information contained in the received signal.
  • step S34 the STA receives the narrowband portion of the signal transmitted by the AP (New modulation portion 2 in the first format in FIG. 5 or New modulation portion 1 and New modulation portion 2 in the second format). After that, the process ends.
  • FIG. 9 is a diagram showing the sequence of information exchange between the central control unit 10 and the AP.
  • step S51 the AP transmits an Information exchange request to the central control unit 10.
  • the central control device 10 receives an Information exchange request sent from the AP.
  • step S53 the central control device 10 transmits to the AP an Information exchange response, which is a response to the received Information exchange request.
  • step S54 the AP receives the Information exchange response sent from the central control device 10.
  • step S55 the AP transmits AP's Information (AP information) to the central control device 10.
  • AP information AP information
  • the central control device 10 receives AP's Information transmitted from the AP.
  • step S57 the central controller 10 transmits Tx parameter Information (information regarding the transmission and reception of the beacon signal described above) to the AP.
  • step S58 the AP receives the Tx parameter information transmitted from the central control device 10. After that, the process ends.
  • processing in FIG. 9 is performed using, for example, wired communication, it may be performed using wireless communication, or may be performed manually by an administrator. In the case of STA, the same processing as in FIG. 9 is performed manually by the administrator, but may be performed using wired communication or wireless communication.
  • Second Embodiment> As a second embodiment of the present technology, an example in which a certain AP transmits a narrowband signal in a terminal management environment area will be described. At that time, the AP transmits a narrowband signal based on frequency information obtained by exchanging information with the central control unit 10 .
  • each format is used independently.
  • one of the formats used by APs to transmit beacon signals is the same as the second format shown in FIG. 4 in the first embodiment.
  • New modulation portion1 and New modulation portion2 are transmitted in RUs that are part of the pre-allocated frequency band.
  • one of the formats used by APs to transmit beacon signals is the third format shown below.
  • FIG. 10 is a diagram showing a configuration example of the third format of the beacon signal transmitted by the AP in the second embodiment.
  • a beacon signal of the third format is composed of a Pre-New modulation portion and a New modulation portion.
  • the Pre-New modulation portion includes L-STF and L-LTF.
  • New modulation portion includes New-SIG, New-STF, New-LTF, Payload and PE.
  • the fields other than Payload and PE are preambles.
  • the preamble is narrowed to Payload and PE, as shown in FIG. 11, which will be described later. Also, for convenience of explanation, only the Payload will be referred to when the Payload is narrowband, but the PE is also narrowband in the same manner as the Payload.
  • each field of L-STF, L-LTF, New-STF, New-LTF, Payload, and PE is the same as the configuration of each field in FIG.
  • the configuration of New-SIG is similar to that of New-SIG-2 in FIG.
  • the Pre-New modulation portion is transmitted in the entire frequency band that the AP has acquired the transmission right or has been pre-assigned.
  • Other configurations of the Pre-New modulation portion are the same as those in FIG.
  • New modulation portion is transmitted in a pre-assigned frequency band.
  • Other configurations of New modulation portion are the same as those of New modulation portion 2 in FIG.
  • FIG. 11 is a diagram showing a timing chart of a first example of a beacon signal transmission sequence according to the second embodiment.
  • FIG. 11 shows an example in which the third format described above with reference to FIG. 10 is used.
  • AP and STA exchange information with central control unit 10 at timing tmn before AP1 transmits a beacon signal.
  • Information obtained by the AP through information exchange includes information on the OFDM signal format and modulation coding scheme used with the RUs to which the new modulation portions 1 and 2 are transmitted, and information on the transmission timing of the beacon signal. This is different from the case of FIG. Other configurations are the same as in the case of FIG.
  • the information that the STA obtains through information exchange includes a combination of the identifier of the AP, the RU to which the new modulation portion is transmitted by the AP, and the OFDM signal format and modulation coding scheme used for the new modulation portion.
  • Information obtained by STA through information exchange may include information on restrictions based on legislation.
  • the information obtained by the STA through information exchange includes information on the maximum transmission power of a certain frequency band, whether or not carrier sensing is necessary, backoff operation parameters, and power detection threshold.
  • AP1 and AP2 start transmitting beacon signals at timing tm , which is the transmission timing obtained by information exchange, in one of a plurality of candidate frequency bands obtained by information exchange.
  • AP1 and AP2 transmit up to the Pre-New modulation portion (L-STF, L-LTF) of the beacon signal using a frequency band of 20 MHz at timing t m .
  • AP1 and AP2 then transmit New modulation portion (New-SIG, New-STF, New-LTF, Payload, PE) at timing t m+1 .
  • New modulation portion (New-SIG, New-STF, New-LTF, Payload, PE)
  • RUs for example, high-band or low-band RUs in a frequency band of 20 MHz
  • OFDM signal formats for example, high-band or low-band RUs in a frequency band of 20 MHz
  • modulation and coding schemes obtained by information exchange are used. After that, the transmission of the beacon signal is completed.
  • Each STA connected to AP1 and AP2 receives the Pre-New modulation portion of the beacon signal transmitted by AP1 and AP2 at timing t m , obtains the RU used by the AP to which it is connected, obtained by exchanging information, and then A beacon signal is received at the timing t m+1 of .
  • FIG. 12 is a diagram showing a timing chart of a second example of a beacon signal transmission sequence according to the second embodiment.
  • FIG. 12 shows an example in which the second format described above with reference to FIG. 4 is used.
  • AP and STA exchange information with central control unit 10 at timing tmn before AP1 transmits a beacon signal.
  • the information obtained by the AP through information exchange does not have to include information on the transmission timing of the beacon signal. Other than that, it is the same as the case of FIG.
  • AP1 and AP2 can exchange RUs (e.g., high or low RUs in the 20 MHz frequency band) on any of a plurality of candidate frequency bands obtained by information exchange; Beacon signal transmission is started using the OFDM signal format and modulation coding scheme.
  • RUs e.g., high or low RUs in the 20 MHz frequency band
  • AP1 and AP2 start transmission at timing tm and end transmission at the same timing, but the start and end timings of transmission may be independent of each other. Other than that, the process is the same as the process in FIG.
  • Each STA connected to AP1 and AP2 waits to receive a beacon signal using the RU (high-band or low-band RU in the 20MHz frequency band) used by the AP it connects to, which is obtained by exchanging information. is detected and received.
  • FIG. 13 is a flowchart for explaining AP processing.
  • step S71 the AP exchanges information with the central control unit 10.
  • step S72 the AP waits until it determines that it is time to transmit a signal in the third format in which a part of the preamble and the payload are band-narrowed. If it is determined in step S72 that it is time to transmit a signal in the narrowed third format, the process proceeds to step S73.
  • step S73 the AP sets communication parameters based on information obtained by exchanging information with the central control unit 10.
  • the AP sets communication parameters based on information obtained by exchanging information with the central control unit 10 and information included in signals received from other APs.
  • step S74 the AP determines whether or not to set transmission power. If it is determined in step S74 that the transmission power is set, the process proceeds to step S75.
  • step S75 the AP sets the transmission power based on the positional relationship between the other APs and the STAs obtained by exchanging information with the central control device 10.
  • step S74 If it is determined in step S74 that the transmission power is not to be set, step S75 is skipped and the process proceeds to step S76.
  • step S76 the AP transmits a signal (New modulation portion in Fig. 11) in the third format in which part of the preamble and payload are narrowband. After that, the process ends.
  • the STA process in the second embodiment is different from FIG. is the same as the STA processing in the first embodiment described above.
  • sequence of information exchange between the central control unit 10 and the AP in the second embodiment is the same as the sequence of information exchange between the central control unit 10 and the AP in the first embodiment described above with reference to FIG. is the processing of
  • signals transmitted using this technology are not limited to beacon signals.
  • a signal sent using the present technology may be a signal sent to a broadcast.
  • signals transmitted using this technology may be Data frames, Trigger frames, Multi-STA BA (Block Ack) frames, NDP (Null Data Packet) announcement frames, NDP frames, etc. specified by IEEE 802.11. good too.
  • the first embodiment and the second embodiment of the present technology it is possible to select and perform an appropriate wireless communication operation based on the wireless communication system that exists or operates in the surrounding area. become.
  • a first signal is transmitted in which at least the first part of the preamble and the payload are narrowbanded.
  • the narrowband signal transmitted by AP2 is orthogonalized with the frequency (RU) used in the signal transmitted by AP1. be able to. As a result, it is possible to suppress an increase in interference due to narrowing of the band in the conventional method of increasing the power density by narrowing the band and expanding the reachable range under the condition that the power is constant.
  • transmission power is set based on the location information of APs and STAs. This makes it possible to further reduce interference due to band narrowing.
  • FIG. 14 is a block diagram showing an example hardware configuration of a computer that executes the series of processes described above by a program.
  • a CPU (Central Processing Unit) 301 , a ROM (Read Only Memory) 302 and a RAM (Random Access Memory) 303 are interconnected by a bus 304 .
  • An input/output interface 305 is further connected to the bus 304 .
  • the input/output interface 305 is connected to an input unit 306 such as a keyboard and a mouse, and an output unit 307 such as a display and a speaker.
  • the input/output interface 305 is also connected to a storage unit 308 such as a hard disk or nonvolatile memory, a communication unit 309 such as a network interface, and a drive 310 that drives a removable medium 311 .
  • the CPU 301 loads a program stored in the storage unit 308 into the RAM 303 via the input/output interface 305 and the bus 304 and executes the above-described series of processes. is done.
  • the program executed by the CPU 301 is recorded on the removable media 311, or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital broadcasting, and installed in the storage unit 308.
  • the program executed by the computer may be a program that is processed in chronological order according to the order described in this specification, or may be executed in parallel or at a necessary timing such as when a call is made. It may be a program in which processing is performed.
  • a system means a set of multiple components (devices, modules (parts), etc.), and it does not matter whether all the components are in the same housing. Therefore, a plurality of devices housed in separate housings and connected via a network, and a single device housing a plurality of modules in one housing, are both systems. .
  • Embodiments of the present technology are not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present technology.
  • this technology can take the configuration of cloud computing in which one function is shared by multiple devices via a network and processed jointly.
  • each step described in the flowchart above can be executed by a single device, or can be shared by a plurality of devices.
  • one step includes multiple processes
  • the multiple processes included in the one step can be executed by one device or shared by multiple devices.
  • a radio communication apparatus comprising a communication control unit that transmits a first signal in which at least a first part of a preamble and a payload are band-narrowed.
  • the wireless communication device according to (1) wherein the communication control unit causes the first signal to be transmitted based on information regarding first transmission/reception obtained by exchange with a central control device.
  • the information on the first transmission/reception includes information on the frequency band of the first signal and information on the frequency band, information on the modulation scheme and coding scheme of the first signal, and transmission power setting of the first signal.
  • the wireless communication device according to (2) above including at least one of information.
  • the first signal is composed of the first part of the preamble that has been narrowed, the payload, and the second part of the preamble that has not been narrowed. (1) or (2) ).
  • the information on the second transmission/reception includes information on the frequency band of the first signal and information on the frequency band, information on the modulation scheme and coding scheme of the first signal, and transmission power setting of the first signal.
  • the wireless communication device according to (5) above including at least one of information.
  • Device. The information on the second transmission/reception includes information on permission to multiplex and transmit the second signal,
  • the radio according to (8), wherein the communication control unit multiplexes the first signal with the second signal and transmits the second signal when transmission with the second signal is permitted.
  • Communication device. (10)
  • the information on the second transmission/reception includes information on the frequency band of the first signal and information on the frequency band, information on the modulation scheme and coding scheme of the first signal, and transmission power setting of the first signal.
  • a wireless communication device A wireless communication method comprising transmitting a first signal in which at least a first portion of a preamble and a payload are narrowbanded.
  • a communication control unit configured to receive a first signal in which at least a first part of a preamble and a payload are narrowband transmitted from a wireless communication device that is connected or that is a candidate for connection. terminal.
  • the wireless communication terminal according to (13), wherein the communication control unit causes the first signal to be received based on information regarding first transmission/reception obtained by exchange with a central control unit.
  • the information on the first transmission/reception includes at least one of the frequency band of the first signal, information on the frequency band, and information on the modulation scheme and coding scheme of the first signal.
  • the first signal is composed of the first portion of the narrowband preamble, the payload, and the second portion of the non-narrowband preamble. (13) or (14) ).
  • the wireless communication terminal according to (14), wherein the first signal is composed of the narrowband preamble and the payload.
  • the communication control unit causes the first signal to be received based on information about second transmission/reception included in a second signal transmitted from another wireless communication device. terminal.
  • the information on the second transmission and reception consists of at least one of the frequency band of the first signal, information on the frequency band, and information on the modulation scheme and coding scheme of the first signal.
  • the wireless communication terminal A wireless communication method for receiving a first signal in which at least a first part of a preamble and a payload are narrowbanded and transmitted from a wireless communication device that is connected or that is a candidate for connection.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente technologie concerne un dispositif de communication sans fil, un terminal de communication sans fil et un procédé de communication sans fil qui permettent d'augmenter le rendement spectral. Le dispositif de communication sans fil émet un signal dans lequel au moins une première partie d'un préambule et une charge utile sont à bande étroite. La présente technologie peut être appliquée à des systèmes de communication sans fil.
PCT/JP2022/003001 2021-04-19 2022-01-27 Dispositif de communication sans fil, terminal de communication sans fil et procédé de communication sans fil WO2022224519A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011015048A (ja) 2009-06-30 2011-01-20 Nippon Telegr & Teleph Corp <Ntt> 制御装置、制御方法およびプログラム
JP2018157265A (ja) * 2017-03-15 2018-10-04 富士通株式会社 無線通信制御システム、無線通信制御装置及び無線通信制御方法
JP2019533343A (ja) * 2016-09-09 2019-11-14 ホアウェイ・テクノロジーズ・カンパニー・リミテッド ウェイクアップパケットを伝送するためのシステムおよび方法
JP2020036206A (ja) * 2018-08-30 2020-03-05 株式会社東芝 電子装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011015048A (ja) 2009-06-30 2011-01-20 Nippon Telegr & Teleph Corp <Ntt> 制御装置、制御方法およびプログラム
JP2019533343A (ja) * 2016-09-09 2019-11-14 ホアウェイ・テクノロジーズ・カンパニー・リミテッド ウェイクアップパケットを伝送するためのシステムおよび方法
JP2018157265A (ja) * 2017-03-15 2018-10-04 富士通株式会社 無線通信制御システム、無線通信制御装置及び無線通信制御方法
JP2020036206A (ja) * 2018-08-30 2020-03-05 株式会社東芝 電子装置

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